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Problem writing to file fs module, apparently the path is positioned at the root level

I'm practicing with typescript and I want to write a file using fs module but I don't know if is this a noob question or I'm doing something wrong but my project look like this:
root
-> dir (here are the js result from tsc)
-> src
--> data
---> data.json
--> service
---> service.ts
--> index.ts
-> package.json
-> tsconfig.json
And at service.ts apparently the path is:
let filePath = path.join('./','src','data','data.json') // this works
fs.writeFile(filePath, JSON.stringify(data,null,2), 'utf8', (err)=>{ if(err){ return console.log(err);}})
So I don't know why the path is positioned at the root level
If I try "../data/data.json" I get ENOENT ERROR no such file or directory
Is it ok?

Filesystem operations with relative paths always use the Current Working Directory - a concept explained here: https://en.m.wikipedia.org/wiki/Working_directory
When you run Node.js, you do so while being in a particular directory. For example, scripts such as npm start are usually executed in the root-level directory of a repository/project - this causes all relative paths to resolve starting from there. Note, however, that this may be different in production - it is possible for Docker, PM2, systemd, or any other tool to run your script while being in a different working directory (this can often be configured).
To inspect your current working directory in Node.js, use https://nodejs.org/api/process.html#processcwd
It is also possible to build paths relative to the directory of the JS file. This tutorial shows various examples on how to do that: https://www.digitalocean.com/community/tutorials/nodejs-how-to-use__dirname
It is important to remember that require() uses paths relative to __dirname, but fs resolves relative to CWD.

Node.js is unable to find a file in another folder

I have a Discord bot I'm maintaining since a year, and a couple of months ago I changed a bit the file structure to clean it up and make it easier for me to know what's going on.
The thing is, whenever I try to request a file (with require) that is in a folder located in the bot's root directory, sometimes it works with "./" and other times it works with "../"
The current file structure is:
----commands
-------commands.js(multiple files)
----images
-------halloween
----------images.png/jpg(multiple images)
----logs
-------bot.log
----modules
------logger.js
----settings
-------config.json
-emojis.json
-gifs.json
-index.js
Following the structure above, when for example I try to request one of the halloween images in a command, the logical thing to me would be to use "../images/halloween/image.png", but instead I have to use "./images/halloween/image.png" as if the "images" folder is within the "commands" folder
In one of the commands I have to use:
const logs = require("../modules/logger");
const background = await Canvas.loadImage("./images/halloween/background.jpg");
I would like to know why this happens. It really messes with my brain seeing an error saying that a file was not found only because node.js decided that this time the parent directory is "./" instead of "../"

Assuming your commands file is making file system calls (because you're accessing an image from it), the directory you invoke your script from can matter. Make sure you're using the path utility to resolve your file locations. See NodeJS accessing file with relative path for more details.

locating path of a file in meteorjs

I have a project in meteorjs that is using the nodes filesystem to read file, but I am not able to locate the file to be read.
My file Location
Server
- startup
- app.load.coffee
- myfileToBeRead.txt
My try in app.load.coffee
fs = Npm.require('fs')
console.log fs.readFileSync 'server/startup/myfileToBeRead.txt'
I am not able to read the file as it says
Error: ENOENT, no such file or directory 'server/startup/myfileToBeRead.txt'
I think since meteor merges everything in a js file, I have to add full path to the file.
I have tried other paths aswell (with the full path, without the full path). Can you point me out to the correct direction here?
Thank you

Well with the answer from David, I also found that I could do this with the assets/app directory of the project. All I had to do was add the file to a directory named private. This would also help me write to a file inside the directory aswell.
fs = Npm.require('fs')
console.log fs.readFileSync "assets/app/myfileToBeREad", 'utf8'

if the file should be checked in
This is the easy case - just place the file in your private directory and access it with the assets api. For more examples, see my blog post on exactly this subject.
if the file should exist somewhere else on the server
Use an absolute path to a directory not associated with your project, e.g. /tmp or /home/foo/bar. Directories inside of a meteor project get jumbled up after you bundle and deploy your app, so their existence can't be counted on. Using your example above it should work if you do something like:
var fs = Npm.require('fs');
fs.readFileSync('/tmp/myfileToBeRead.txt');

Requring all the files in a directory nodejs

The topic may seem to be duplicate. Read it completely
I know there are multiple packages available in nodejs to require all the files in a directory.
But I am in a research to require all the files in a folder and use the variables and functions which are exported in each js file. Need to perform this just by requiring the directory name.
For example,
var files = require("./folder");
The folder may contain some files like
File1.js, File2.js, File3.js
I want to use all the variables and functions which are exported in all the js files.
I think there might be some way in the "Package.json" file.
But I am not expert in "Package.json".
Can anyone help me to figure out the senario?

Could you just make an index.js file with the modules and just require that.
From the docs http://nodejs.org/api/modules.html#modules_loading_from_the_global_folders
It is convenient to organize programs and libraries into self-contained directories, and then provide a single entry point to that library. There are three ways in which a folder may be passed to require() as an argument.
The first is to create a package.json file in the root of the folder, which specifies a main module. An example package.json file might look like this:
{ "name" : "some-library",
"main" : "./lib/some-library.js" }
If this was in a folder at ./some-library, then require('./some-library') would attempt to load ./some-library/lib/some-library.js.
This is the extent of Node's awareness of package.json files.
If there is no package.json file present in the directory, then node will attempt to load an index.js or index.node file out of that directory. For example, if there was no package.json file in the above example, then require('./some-library') would attempt to load:
./some-library/index.js
./some-library/index.node

DOJO include files a directory back

I have dojo files in resources/js/dojo1.6/dojo/dojo.js
I have another file here resources/js/pages/file1.js
This file requires another file which is located at resources/js/folder/file2.js
This is how I am including it dojo.require('folder.file2');
So these three folder are in hirarchy
dojo1.6, pages and folder
When I run application
I got the following error
File not found: /resources/js/dojo1.6/folder/file2.js
How can I overcome this error.

You need to tell Dojo where your modules can be found, relative to dojo.js, using dojo.registerModulePath:
dojo.registerModulePath("pages", "../../pages");
dojo.registerModulePath("folder", "../../folder");
See http://dojotoolkit.org/reference-guide/dojo/registerModulePath.html for a more detailed explanation.